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Abstract
The structures of two new phases were determined by single crystal diffractometric data. The phse ThFe0.22(2)Sn2, orthorhombic, space group Cmcm (No. 63). Pearson symbol S16-3.12, a = 4.479(1), b = 17.045(3), c = 4.430(1) Å, V = 338.2(1) Å, Z = 4, R = 0.038 for 260 reflection with F > 4σ(F) has a defective structure derived from the CeNiSi2 type. The phase Th4Fe11Sn5, tetragonal, space group P4/mbm (No. 127). Pearson symbol IP44, a = 8.290(1), c = 11.946(1) Å, V = 821.0(2) Å, Z = 2, R = 0.061 for 760 reflections with F11 > 4σ(F11) shows a structure of a new type, formed by two segments which alternate along the c-axis. One segment shows an atomic arrangement very similar to that of the Ce(Mn,Ni)11 structure, while the other corresponds to a half-cell of the Cr5B3 type. Slabs of centered icosahedra containing only iron atoms are a characteristic feature of this structure, common also, besides the cited Ce(Mn,Ni)11, to the Ce2Ni12Si4 and Nd6Fe11Si for La6Co11Ga) structures. For the phase Th4Fe11Sn5 a transition to the ferromagnetic state at 375 K was observed by differential scanning calorimetry, electrical and magnetic measurements.
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